Ubuntu boot takes long time, and on boot I get these errors:
Similar errors appear on shutdown (which is also slow), however Windows 10 on the same SSD boots normally. I tried to reinstall Ubuntu, but that fixed nothing and same errors occur when I boot from live USB. What's the problem and how can I try to fix it?
smartctl
from the terminal) and run a disk self-test. You can also try unplugging the disk and replugging it e.g. in a different socket and with a different cable. – Byte Commander Feb 09 '18 at 21:02